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2023-26-02 BOMBARDIER, INC.: Amendment 39-22645; Docket No. FAA-2023-1890; Project Identifier MCAI-2023-00283-T.
(a) EFFECTIVE DATE

    This airworthiness directive (AD) is effective February 27, 2024.

(b) AFFECTED ADS

    None.

(c) APPLICABILITY

    This AD applies to all Bombardier, Inc.,  Model BD-100-1A10 airplanes,
    certificated in any category.

(d) SUBJECT

    Air Transport Association (ATA) of America Code: 36, Pneumatic.

(e) UNSAFE CONDITION

    This AD was prompted by  reports from the supplier that  some overheat
    detection sensing elements of the bleed air leak detection system were
    manufactured with insufficient salt fill.  The FAA is issuing this  AD
    to  address  non-conforming sensing  elements  of the  bleed  air leak
    detection system. The unsafe condition, if not addressed, could result
    in an inability to detect hot bleed air leaks and consequent damage to
    surrounding structures and systems, which could prevent continued safe
    flight and landing.

(f) COMPLIANCE

    Comply with this AD within the compliance times specified,  unless al-
    ready done.

(g) DEFINITIONS

(1) For purposes of this AD,  an affected part is a sensing element marked
    with a date code A0448 through A2104 inclusive and having an LTS/Kidde
    part number  specified  in  Liebherr Service Bulletin CFD-F1958-26-01,
    dated May 6, 2022,  unless  that  sensing  element  meets the criteria
    specified in either paragraph (g)(1)(i) or (ii) of this AD.

(i) The sensing element  has been tested  as specified in Section 3 of the
    Accomplishment Instructions  of  Kidde Aerospace  and  Defense Service
    Bulletin CFD-26-1, Revision 6, dated February 28, 2022, or earlier re-
    visions, and has been found to be serviceable; and the sensing element
    has been marked on one face of its connector hex nut  and  packaged as
    specified in Section 3.C.  of the Accomplishment Instructions of Kidde
    Aerospace and Defense  Service Bulletin CFD-26-1,  Revision  6,  dated
    February 28, 2022, or earlier revisions.

(ii) The sensing element  has been tested  and  found to be serviceable as
     specified in paragraph (i) of this AD;  and  the  sensing element has
     been marked on one face of one connector hex nut with one green mark,
     as specified  in Figure 11 of Bombardier  Service Bulletin 100-36-10,
     dated December 23, 2022,  or  Bombardier Service Bulletin 350-36-003,
     dated December 23, 2022, as applicable  (the figure is representative
     for all sensing elements).

(2) For purposes of this AD,  a serviceable part is a sensing element that
    is not an affected part.

(h) REVISION OF THE EXISTING AIRPLANE FLIGHT MANUAL (AFM)

    For  airplane  serial numbers 20001 through 20457 inclusive  and 20501
    through 20906 inclusive:  Within 30 days  after the effective date  of
    this AD,  revise the existing AFM to include the information specified
    in paragraphs (h)(1) and (2) of this AD, as applicable.

(1) For airplane serial numbers 20001 through 20457 inclusive: Section 05-
    42, Air Conditioning & Pressurization,  Non-Normal Procedures Section,
    Bombardier Challenger 300 AFM (Imperial Version),  Publication No. CSP
    100-1, Revision 71, dated November 9, 2022.

Note 1 to Paragraph (h)(1):  For obtaining  the procedures  for Bombardier
Challenger 300 AFM (Imperial Version), Publication No. CSP 100-1, use Doc-
ument Identification No. CH 300 AFM-I.

(2) For airplane serial numbers 20501 through 20906 inclusive: Section 05-
    42,  Airconditioning & Pressurization,  Non-Normal Procedures Section,
    Bombardier Challenger 350 AFM, Publication No. CH 350 AFM, Revision 37
    dated November 9, 2022.

Note 2 to Paragraph (h)(2):  For obtaining  the procedures  for Bombardier
Challenger 350 AFM,  Publication No. CH 350 AFM,  use Document Identifica-
tion No. CH 350 AFM.

(i) TESTING OF OVERHEAT DETECTION SENSING ELEMENTS

    For  airplane  serial numbers 20001 through 20457 inclusive  and 20501
    through 20906 inclusive:  Within 7,500  flight  cycles  or  96 months,
    whichever occurs first,  from the effective date of this AD,  test the
    overheat detection sensing elements  to determine if they are service-
    able, in accordance with the Accomplishment Instructions of Bombardier
    Service Bulletin 100-36-10,  dated  December 23, 2022;  or  Bombardier
    Service Bulletin 350-36-003, dated December 23, 2022, as applicable.

(1) For each sensing element that is serviceable,  before  further flight,
    mark the sensing element  with  a  witness mark in accordance with the
    Accomplishment Instructions  of Bombardier Service Bulletin 100-36-10,
    dated December 23, 2022;  or  Bombardier  Service Bulletin 350-36-003,
    dated December 23, 2022; as applicable.

(2) For  each  sensing  element  that is not serviceable,  before  further
    flight, replace the sensing element with a serviceable part in accord-
    ance with the Accomplishment Instructions of Bombardier Service Bulle-
    tin 100-36-10, dated December 23, 2022; or Bombardier Service Bulletin
    350-36-003, dated December 23, 2022; as applicable.

(j) PARTS INSTALLATION PROHIBITION

    As of the effective date of this AD, no person may install an affected
    part on any airplane.

(k) NO REPORTING REQUIREMENT

    Although  Bombardier  Service Bulletin 100-36-10,  dated  December 23,
    2022;  and Bombardier Service Bulletin 350-36-003,  dated December 23,
    2022;  specify to submit certain information to the manufacturer, this
    AD does not include that requirement.

(l) ADDITIONAL AD PROVISIONS

    The following provisions also apply to this AD:

(1) Alternative Methods of Compliance (AMOCs):  The Manager, International
    Validation Branch, FAA,  has the authority  to approve AMOCs  for this
    AD,  if requested  using  the  procedures found  in 14  CFR 39.19.  In
    accordance with  14 CFR  39.19, send  your request  to your  principal
    inspector or responsible Flight  Standards Office, as appropriate.  If
    sending  information  directly  to the  manager  of  the International
    Validation  Branch, mail  it to  the address  identified in  paragraph
    (m)(2)  of  this  AD.  Information  may  be  emailed  to:  9-AVS-NYACO
    -COS@faa.gov. Before using any approved AMOC, notify your  appropriate
    principal inspector, or lacking a principal inspector, the manager  of
    the responsible Flight Standards Office.

(2) Contacting the Manufacturer:  For any requirement in this AD to obtain
    instructions   from   a  manufacturer,   the   instructions  must   be
    accomplished using  a method  approved by  the Manager,  International
    Validation Branch,  FAA; or  Transport Canada;  or Bombardier,  Inc.'s
    Transport Canada  Design Approval  Organization (DAO).  If approved by
    the DAO, the approval must include the DAO-authorized signature.

(m) ADDITIONAL INFORMATION

(1) Refer to Transport Canada AD CF-2023-09,  dated February 14, 2023, for
    related information.  This Transport Canada AD  may be found in the AD
    docket at regulations.gov under Docket No. FAA-2023-1890.

(2) For more information about this AD,  contact Steven Dzierzynski, Avia-
    tion Safety Engineer,  FAA,  1600 Stewart Avenue, Suite 410, Westbury,
    NY 11590; telephone 516-228-7300; email 9-avs-nyaco-cos@faa.gov.

(n) MATERIAL INCORPORATED BY REFERENCE

(1) The Director of the Federal Register  approved  the  incorporation  by
    reference  (IBR)  of the service information  listed in this paragraph
    under 5 U.S.C. 552(a) and 1 CFR part 51.

(2) You must use this service information as applicable  to do the actions
    required by this AD, unless this AD specifies otherwise.

(i) Bombardier Service Bulletin 100-36-10, dated December 23, 2022.

(ii) Bombardier Service Bulletin 350-36-003, dated December 23, 2022.

(iii) Section 05-42, Air Conditioning & Pressurization,  Non-Normal Proce-
      dures Section,  Bombardier Challenger 300  AFM  (Imperial  Version),
      Publication No. CSP 100-1, Revision 71, dated November 9, 2022.

Note 3 to Paragraph (n)(2)(iii):  For obtaining the procedures for Bombar-
dier Challenger 300 AFM (Imperial Version), Publication No. CSP 100-1, use
Document Identification No. CH 300 AFM-I.

(iv) Section 05-42,  Air Conditioning & Pressurization,  Non-Normal Proce-
     dures Section, Bombardier Challenger 350 AFM,  Publication No. CH 350
     AFM, Revision 37, dated November 9, 2022.

Note 4 to Paragraph (n)(2)(iv):  For obtaining the procedures  for Bombar-
dier Challenger 350 AFM, Publication No. CH 350 AFM,  use Document Identi-
fication No. CH 350 AFM.

(v) Liebherr Service Bulletin CFD-F1958-26-01, dated May 6, 2022.

(3) For Bombardier service information identified in this AD, contact Bom-
    bardier Business Aircraft  Customer  Response  Center,  400 Cote-Vertu
    Road West, Dorval, Quebec H4S 1Y9, Canada;  telephone 514-855-2999; e-
    mail ac.yul@aero.bombardier.com; website bombardier.com.

(4) For Liebherr-Aerospace Toulouse SAS  service information identified in
    this AD,  contact Liebherr - Aerospace Toulouse SAS,  408,  Avenue des
    Etats-Unis-B.P.52010, 31016 Toulouse Cedex, France;  telephone +33 (0)
    5.61.35.28.28;fax +33 (0)5.61.35.29.29;email techpub.toulouse@liebherr
    .com; website liebherr.aero.

(5) You may view this service information at the FAA,  Airworthiness Prod-
    ucts Section, Operational Safety Branch,  2200 South 216th Street, Des
    Moines, WA.  For information  on the availability  of this material at
    the FAA, call 206-231-3195.

(6) You may view this material at the National Archives and Records Admin-
    istration (NARA). For information on the availability of this material
    at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations, or
    email fr.inspection@nara.gov.

Issued on December 21, 2023.  Caitlin Locke,  Director,  Compliance & Air-
worthiness Division, Aircraft Certification Service.

FOR FURTHER INFORMATION CONTACT: Steven Dzierzynski, Aviation Safety Engi-
neer, FAA, 1600 Stewart Avenue, Suite 410,  Westbury, NY 11590;  telephone
516-228-7300; email 9-avs-nyaco-cos@faa.gov.
PREAMBLE 

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2023-1890; Project Identifier MCAI-2023-00283-T;
Amendment 39-22645; AD 2023-26-02]
RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc., Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all
Bombardier, Inc., Model BD-100-1A10 airplanes. This AD was prompted by
reports from the supplier that some overheat detection sensing elements
of the bleed air leak detection system were manufactured with
insufficient salt fill, which can result in an inability to detect hot
bleed air leaks. This AD requires revising the existing airplane flight
manual (AFM) to include procedures to prevent takeoff with an active
bleed air leak annunciated while on the ground. This AD also requires
testing the overheat detection sensing elements, marking each
serviceable sensing element with a witness mark, and replacing each
nonserviceable part with a serviceable part. This AD also prohibits the
installation of affected parts. The FAA is issuing this AD to address
the unsafe condition on these products.

DATES: This AD is effective February 27, 2024.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of February 27,
2024.

ADDRESSES:
AD Docket: You may examine the AD docket at regulations.gov under
Docket No. FAA-2023-1890; or in person at Docket Operations between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD
docket contains this final rule, the mandatory continuing airworthiness
information (MCAI), any comments received, and other information. The
address for Docket Operations is U.S. Department of Transportation,
Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200
New Jersey Avenue SE, Washington, DC 20590.
Material Incorporated by Reference:
For Bombardier service information identified in this
final rule, contact Bombardier Business Aircraft Customer Response
Center, 400 Cote-Vertu Road West, Dorval, Quebec H4S 1Y9,
Canada; telephone 514-855-2999; email ac.yul@aero.bombardier.com;
website bombardier.com.
For Liebherr-Aerospace Toulouse SAS service information
identified in this AD, contact Liebherr-Aerospace Toulouse SAS, 408,
Avenue des Etats-Unis--B.P.52010, 31016 Toulouse Cedex, France;
telephone +33 (0)5.61.35.28.28; fax +33 (0)5.61.35.29.29; email
techpub.toulouse@liebherr.com; website liebherr.aero.
You may view this service information at the FAA,
Airworthiness Products Section, Operational Safety Branch, 2200 South
216th Street, Des Moines, WA. For information on the availability of
this material at the FAA, call 206-231-3195. It is also available at
regulations.gov under Docket No. FAA-2023-1890.

FOR FURTHER INFORMATION CONTACT: Steven Dzierzynski, Aviation Safety
Engineer, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
telephone 516-228-7300; email 9-avs-nyaco-cos@faa.gov.

SUPPLEMENTARY INFORMATION:

Background

The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to all Bombardier, Inc.,
Model BD-100-1A10 airplanes. The NPRM published in the Federal Register
on September 29, 2023 (88 FR 67118). The NPRM was prompted by AD CF-
2023-09, dated February 14, 2023, issued by Transport Canada, which is
the aviation authority for Canada (referred to after this as the MCAI).
The MCAI states that Bombardier received reports from the supplier of
the overheat detection sensing elements of a manufacturing quality
escape. Some of the sensing elements of the bleed air leak detection
system were manufactured with insufficient salt fill. This condition
can result in an inability to detect hot bleed air leaks, which can
cause damage to surrounding structures and systems and prevent
continued safe flight and landing.
In the NPRM, the FAA proposed to require revising the existing AFM
to include procedures to prevent takeoff with an active bleed air leak
annunciated while on the ground. The FAA also proposed to require
testing the overheat detection sensing elements, marking each
serviceable sensing element with a witness mark, and replacing each
nonserviceable part with a serviceable part. The FAA also proposed to
prohibit the installation of affected parts. The FAA is issuing this AD
to address the unsafe condition on these products.
You may examine the MCAI in the AD docket at regulations.gov under
Docket No. FAA-2023-1890.

Discussion of Final Airworthiness Directive

Comments

The FAA received a comment from an anonymous commenter who has
experience troubleshooting and maintaining environmental control
systems (bleed air). No changes to the AD were requested. The commenter
stated revising the AFM procedures will prevent costly maintenance and
implementing extra safety features will also be cost effective and
favor pilot safety. The FAA infers that the commenter supports the AD.

Conclusion

This product has been approved by the aviation authority of another
country and is approved for operation in the United States. Pursuant to
the FAA's bilateral agreement with this State of Design Authority, it
has notified the FAA of the unsafe condition described in the MCAI
referenced above. The FAA reviewed the relevant data and determined
that air safety requires adopting this AD as proposed. Accordingly, the
FAA is issuing this AD to address the unsafe condition on this product.
Except for minor editorial changes, this AD is adopted as proposed in
the NPRM. None of the changes will increase the economic burden on any
operator.

Related Service Information Under 1 CFR Part 51

The FAA reviewed Liebherr Service Bulletin CFD-F1958-26-01, dated
May 6, 2022, which specifies part numbers for affected sensing
elements.
Bombardier has issued the following service information. This
service information describes procedures to prevent the takeoff of an
airplane with an active bleed air leak annunciated while on the ground.
These documents are distinct since they apply to different airplane
models.

Section 05-42, Air Conditioning & Pressurization, Non-
Normal Procedures Section, Bombardier Challenger 300 AFM (Imperial
Version), Publication No. CSP 100-1, Revision 71, dated November 9,
2022. (For obtaining the procedures for Bombardier Challenger 300 AFM
(Imperial Version), Publication No. CSP 100-1, use Document
Identification No. CH 300 AFM-I.)
Section 05-42, Air Conditioning & Pressurization, Non-
Normal Procedures Section, Bombardier Challenger 350 AFM, Publication
No. CH 350 AFM, Revision 37, dated November 9, 2022. (For obtaining the
procedures for Bombardier Challenger 350 AFM, Publication No. CH 350
AFM, use Document Identification No. CH 350 AFM.)
The FAA also reviewed Bombardier Service Bulletin 100-36-10, dated
December 23, 2022; and Bombardier Service Bulletin 350-36-003, dated
December 23, 2022; which specify procedures for testing each leak
detection loop sensing element installed on the airplane, marking each
serviceable sensing element with a witness mark, and replacing each
nonserviceable part with a serviceable part. These documents are
distinct since they apply to different airplane models.
This service information is reasonably available because the
interested parties have access to it through their normal course of
business or by the means identified in the ADDRESSES section.

Costs of Compliance

The FAA estimates that this AD affects 317 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:

Estimated Costs for Required Actions

Labor cost
Parts cost
Cost per product
Cost on U.S. operators
Up to 77 work-hours x $85 per hour = $6,545
$0
Up to $6,545 Up to $2,074,765

The FAA has received no definitive data on which to base the cost
estimates for the on-condition actions specified in this AD. The FAA
estimates it would take up to 1.5 hours to replace one sensor.
The FAA has included all known costs in its cost estimate.
According to the manufacturer, however, some or all of the costs of
this AD may be covered under warranty, thereby reducing the cost impact
on affected operators.

Authority for This Rulemaking

Title 49 of the United States Code specifies the FAA's authority to
issue rules on aviation safety. Subtitle I, section 106, describes the
authority of the FAA Administrator. Subtitle VII: Aviation Programs,
describes in more detail the scope of the Agency's authority.
The FAA is issuing this rulemaking under the authority described in
Subtitle VII, Part A, Subpart III, Section 44701: General requirements.
Under that section, Congress charges the FAA with promoting safe flight
of civil aircraft in air commerce by prescribing regulations for
practices, methods, and procedures the Administrator finds necessary
for safety in air commerce. This regulation is within the scope of that
authority because it addresses an unsafe condition that is likely to
exist or develop on products identified in this rulemaking action.

Regulatory Findings


This AD will not have federalism implications under Executive Order
13132. This AD will not have a substantial direct effect on the States,
on the relationship between the national government and the States, or
on the distribution of power and responsibilities among the various
levels of government.
For the reasons discussed above, I certify that this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Will not affect intrastate aviation in Alaska, and
(3) Will not have a significant economic impact, positive or
negative, on a substantial number of small entities under the criteria
of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.

The Amendment

Accordingly, under the authority delegated to me by the
Administrator, the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

1. The authority citation for part 39 continues to read as follows:

Authority: 49 U.S.C. 106(g), 40113, 44701.

Sec. 39.13 [Amended]

2. The FAA amends Sec. 39.13 by adding the following new airworthiness
directive: